SQL limit SELECT but not JOIN

Question

I\'m implementing pagination on my BD. My problem is when I want limit the SELECT statement but not the JOIN. Example, a product can got many prices:

SELECT * FR         


        

Answer 1

Modify your query to limit the number of product rows before joining it to the price table. This means we want to to join the results of a query to a table, or in other words, we write a query containing a subquery:

SELECT *
FROM (
    SELECT *
    FROM product
    ORDER BY id_product
    LIMIT 3
) p
LEFT JOIN price ON p.id = price.id_product

Hope that helps.